java.lang.UnsupportedClassVersionError: Bad version number in .class file
出现这个问题时，要注意三个方面，网上都是简单的说了一下，现总结如下：
1、你所用的代码的jdk与目前的编译环境的jdk不一样，在当前工程上点右键选择"属性"，进去后在Java build path进去修改即可。
2、进到当前工程的属性后，选择"Java Compiler"进去后将"Compiler Compliance level"改成当前jdk的版本
3、windows->preferences->MyEclipse Enterprise Workbench->Servers->Tomcat->选择一人版本的tomcat->JDK->修改成当前使用的JDK版本即可。
将以上三步都修改好后，一开始所提的错误就没有了，如果有的时候不改第三个，这个错误会一直存在。
本文出自 “乔磊的博客 学习 进步” 博客，请务必保留此出处http://sucre.blog.51cto.com/1084905/353608
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